package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.entity.Category;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.CategoryService;
import net.bytebuddy.utility.nullability.AlwaysNull;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class CategoryServiceImpl implements CategoryService {

    @Autowired
    private CategoryMapper categoryMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增分类
     *
     * @param categoryDTO
     */
    public void add(CategoryDTO categoryDTO) {

        //创建分类对象
        Category category = new Category();

        //对象拷贝
        BeanUtils.copyProperties(categoryDTO, category);

        //设置状态(默认为启用)
        category.setStatus(StatusConstant.ENABLE);

        //设置创建时间
        //category.setCreateTime(LocalDateTime.now());

        //设置更新时间
        //category.setUpdateTime(LocalDateTime.now());

        //创建人信息
        //category.setCreateUser(BaseContext.getCurrentId());

        //更新人信息
        //category.setUpdateUser(BaseContext.getCurrentId());

        //执行插入操作
        categoryMapper.insert(category);
    }

    /**
     * 删除分类
     *
     * @param id
     */
    public void deleteById(Long id) {

        //查询当前分类是否关联了菜品，如果关联了，则抛出业务异常
        Integer count = dishMapper.countByCategoryId(id);
        if (count > 0) {
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        //查询当前菜品是否关联了套餐，如果关联了，则抛出业务异常
        count = setmealMapper.countByCategoryId(id);
        if (count > 0) {
            //当前分类下有套餐，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

        //删除分类数据
        categoryMapper.deleteById(id);
    }

    /**
     * 修改分类
     *
     * @param categoryDTO
     */
    public void update(CategoryDTO categoryDTO) {

        //创建分类对象
        Category category = new Category();

        //对象拷贝（将categoryDTO中的属性拷贝到category中）
        BeanUtils.copyProperties(categoryDTO, category);

        //设置修改时间、修改人
        //category.setUpdateTime(LocalDateTime.now());
        //category.setUpdateUser(BaseContext.getCurrentId());

        categoryMapper.update(category);

    }

    /**
     * 修改分类状态
     *
     * @param status
     * @param id
     */
    public void setStatus(Integer status, Long id) {
        Category category = Category.builder().id(id).status(status).build();
        categoryMapper.update(category);
    }

    /**
     * 根据类型查询分类
     *
     * @param type
     * @return
     */
    public List<Category> list(Integer type) {
        return categoryMapper.list(type);
    }

    /**
     * 分页查询
     *
     * @param categoryPageQueryDTO
     * @return
     */
    public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
        PageHelper.startPage(categoryPageQueryDTO.getPage(), categoryPageQueryDTO.getPageSize());
        //下一条sql进行分页，自动加入limit关键字分页
        Page<Category> page = categoryMapper.pageQuery(categoryPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }
}
